Saw.



R. HOE, JR-

SAW. APPLICATION FILED DBO. 10, 1907.

Patented'Nov. 30, 1909.

ANDREW a. qn mm co. Pmm-utgioqnwnzns. WASIUNGYON. u. c

ROBERT HOE, J 3., OF NEW YORK, N. Y.

SAW.

Specification of Letters Patent.

Application filed December 10, 1907.

Patented Nov. 36, 1909.

Serial No. 405,853.

To all whom it may concern:

Be it known that 1, ROBERT HOE, Jr., a citizen of the United States,residing at New York, county of New York, and State of New York, haveinvented certain new and useful Improvements in Saws, fully describedand represented in the following specification and the accompanyingdrawings, forming a part of the same.

This invention relates to certain improvements in inserted tooth saws.

This invention has for its objectto produce an inserted tooth saw whichshall be capacitated to receive a large number of teeth for a givendiameter or length of sawblade, and in which the teeth, when inposition, shall have a firm bearing in the saw andv yet can be readilyplaced in position and removed when required.

With this and other objects in view, the invention consists in certainconstructions and improvements as will be hereinafter fully describedand then specifically pointed out in the claims.

Referring to the accompanying drawings: Figure 1 illustrates a portionof a sawblade provided with the improved inserted teeth. Fig. 2 is anenlarged detail view of the tooth. Fig. 3 is an enlarged detail view ofthe locking device. Fig. 4 is an edge view of the'construction shown inFig. 3. Fig. 5 is a detail view showing one of the teeth and the lockingdevice partly inserted in the saw. Fig. 6 is a similar view showing thetooth and locking device fully inserted, but the locking device not inlooking position.

Referring to the drawings, 1 illustrates a part of a saw-blade, saidblade being provided with the usual shoulders 2. The teeth hereinafterdescribed are located in sockets which are formed by recessing out theblade, the sockets thus formed being marked 8. The rear wall of thesocket is formed by the front side 4: of the shoulder 2 and the frontwall of the socket is formed by the wall 5. The teeth will be made of awidth so as to fit snugly in the sockets and to find a bearing againstthe front and rear walls thereof. In the best constructions, the wall 5will, however, be made shorter than the wall 4. The tooth is illustratedat 6. As usual in inserted tooth saws, the front and rear wall of thesocket may be made V-shaped, as shown, these V-shaped walls engaginggrooves 7, 8 on the front and rear of the tooth.

In order to hold the tooth firmly in position, a locking device isprovided which may be varied in construction. In the best constructions,this locking device will be to tatable and will be located in a lockingopening formed by cutting a recess 9 in the front of the tooth and arecess 10- in the wall of the plate. The recess 10 may be cut in theblade just above the end of the wall 5 and as this wall is shorter, thisrecess may be brought well toward the bottom of the tooth, so that thelocking device does not interfere with the throat room for the tooth. Inthe best constructions, furthermore, the rotatable locking device,indicated at 11, will be generally circular in outline. It will beprovided, however, with a rentrant curve, as 12, for a purpose whichwill hereinafter appear. This locking device may be provided on its edgewith a groove 13 which groove is arranged to engage the wall of therecess 10 which may be made V-shape for this purpose. The locking membermay be slotted, as shown at 14, and this slot may terminate in acircular opening, as 15, which forms a bearing for a projection on thewrench employed for inserting and removing the locking device ofinserted saw teeth. It will be observed that when the tooth is inposition the locking opening formed by the recesses 9, 10 is in opencommunication with the throat room for the tooth.

In order to insert the tooth, the locking member is placed in the toothand the two are then slid into position, the rentrant curve on thelocking member permitting it to pass the projection formed by cuttingthe recess 10 in the plate. The position of the parts when the tooth hasbeen inserted far enough, so that the locking member has passed thisshoulder, is illustrated in Fig. 5. In Fig. 6, the tooth is shown asfully seated but the locking member is not shown in looking position. Tofirmly lock the tooth in place, the locking member 11 is rotated fromthe position shown in Fig. 5 to the position shown in Fig. 1.

To assist in holding the locking member in position, retaining means maybe provided. These means may be formed by providing either the lockingmember or the wall of the opening in which it lies with a notch, and theother member with a correspending projection. As shown, the Wall of therecess 9 is provided with a notch 16 and the member is provided with aprojection 17 which interlocks with the notch, as is clearly shown inFig. 1;

It will be seen. that the construction described provides an exceedinglyfirm bearing for the tooth. The strains set up on the point of the toothduring the cutting operation will not tend to loosen the tooth, for thereason that the strains are taken up in part by the base of the toothbearing against the bottom of the socket, and in part by the bearing ofthe front wall of the tooth against the front wall 5 of the socket,which though shorter than the rear wall of the socket has stillsutlicient extent to firmly hold the tooth. By making this wall short,as illustrated, room is provided for the insertion of the locking deviceand this without interfering to any appreciable extent with the throatroom which, in saws constructed in accordance with the invention for thepur pose of cutting wood, may be large, thereby taking care of thesaw-dust and preventing the saw-dust from choking in the opening. Thelocking member has a very firm seat so that it prevents the tooth frombeing displaced laterally and at the same time it can be readilyinserted and removed. q

The inserted tooth construction is adapted for use in saws for cuttingvarious materials, such as wood, metal and stone, and has the furtheradvantage that it may be applied to very thin blades. Further, the toothcan be made very narrow, so that a large number of teeth can be insertedin a saw and yet provide for a liberal amount of material in thesupporting shoulders and a large throat room where such throat room isdesirable. It will be understood, of course, that the shape of the teethwill be varied according to the particular purpose for which the saw isdesigned to be used.

The invention may be carried into effect by constructions which varyfrom that described and illustrated, and the invention is not,therefore, to be limited to the precise construction herein describedand shown in the drawings.

iVhat is claimed is 1. In an inserted tooth saw, the combination with ablade having a series of sockets, each socket having a back bearing walland a shorter front wall, of a series of teeth litting in said sockets,each tooth being in bearing contact with the front and back wall of thesocket, each tooth and the part of the blade opposite the tooth beingprovided with arc-shaped recesses, the arcs being struck from the samecenter and together forming a circular locking opening the circumferenceof which is somewhat more than half a circle, said opening being in opencommunication with the throat room for the tooth, a series of circularrotatable spring locking devices lying in said openings, and means forpositively retaining the locking devices in their locking position.

2. In an inserted tooth saw, the combina' tion with a blade having aseries of sockets, each socket having a back bearing wall and a shorterfront wall, of a series of teeth fitting in said sockets, each toothbeing in bearing contact with the front and back wall of the socket,each tooth and the part of the blade opposite the tooth being providedwith arc-shaped recesses, the arcs being struck from the same center andtogether forming a circular locking opening the circumferem-e of whichis somewhat more than half a circle, said opening being in opencommunication with the throat room for the tooth, and a series ofcircular rotatable spring locking devices in said openings, each lockingde vice and the opening in which it lies being provided with aninterlocking projection and a retaining notch.

8. In an inserted tooth saw, the combination with a blade having asocket therein, of a tooth lying in the socket, the tooth and bladebeing provided with arc-shaped rccesses struck from the same centerwhich face each other to provide a locking opening which is somewhatmore than half a circle, said opening being in open communication withthe throat room of the tooth, and a rotatable spring locking member ofgeneral circular outline lying in said opening, said member having areentrant curve whereby it may be inserted into the locking opening,each locking device and the opening in which it lies being provided withan interlocking projection and a retaining notch.

I11 testimony whereof, I have hereunto setmy hand, in the presence oftwo subscribing witnesses.

ROBERT HOE, Jn.

Witnesses P. B. PHILIPP, A. VI-UTE.

